Device Names With Definitions

Question 1

Master element

Answer 1

The initiating device to place an equipment in or out of operation

Question 2

Time delay starting or closing relay

Answer 2

Gives a desired amount of delay between operations in an automatic sequence

Question 3

Master contactor or relay

Answer 3

Generally controlled by device no. 1, to place an equipment into operation under the desired conditions and to take it out of operations under other or abnormal conditions

Question 4

Stopping device

Answer 4

Primary function is to place and hold an equipment out of operation

Question 5

Starting circuit breaker, contactor or switch

Answer 5

Principal function is to connect a machine to its source of starting voltage

Question 6

Anode circuit breaker

Answer 6

Used in the anode circuits of a power rectifier primarily to interrupt the rectifier circuit on arc back

Question 7

Control power switch

Answer 7

Manually operated switch or circuit breaker used for the express purpose of connecting and disconnecting the source of control power to and from the control bus or equipment

Question 8

Reversing device

Answer 8

Used to reverse the shunt field connections of a synchronous converter during the starting sequence or for other special reversing functions

Question 9

Unit sequence switch

Answer 9

Used to change the sequence of placing units in and out of service in multiple unit equipment